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Ellanneh Smith, 13, was left in hospital on May 5 after another student at her school in Coulsdon took part in the craze.

Rebecca Smith, Ellanneh's mum, said: "Ellanneh went to school and I received a phone call around lunchtime saying Ellanneh had hurt herself. I didn't go down there in the first place because they didn't say she had broken her arm.

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Miss Smith has been in regular contact with the school ever since the incident and believes it isn't the first time such an incident has happened.

"This isn't the first incident either. There have been other incidences around the school according to my daughter,” she said.

In a statement to the Croydon Advertiser, Oasis Academy Coulsdon said behaviour like this "will not be tolerated" at the school.

The statement said: "An incident took place at the academy last week during lunchtime in which one of our students was injured due to the unsafe behaviour of another.

"The principal [Andy Booth] has appropriately sanctioned the student responsible for their conduct, who has also apologised unreservedly. We have made clear to our student body that unsafe behaviour will not be tolerated."

The school has not said what punishment was dished out to the student behind the dangerous prank.

Other stupid playground crazes included the so-called ‘school-bag challenge’ sees a gang of pupils targeting one pupil and using their school bags to hit them or throw at them, pointing laser pens in children’s eyes, and making unicorn slime (don’t ask)